Showing posts with label dynamic range. Show all posts
Showing posts with label dynamic range. Show all posts

Monday, September 23, 2013

Improve Our Seeing

Greetings and welcome to Hohenfels Volks, THE place for our place! Hohenfels is getting ripe for photographic opportunities. Within the next couple weeks, the “autumnal fireworks” will really be in swing. Time to explore our areas and get your images made!

Today we’re going to provide a couple exercises to get you thinking about your photography and small ways to improve.

First up, we’re going to look at the use of tone and tonal variations to improve our shots. The exercise is simple enough. You’re going to need a couple lightly textured items to photograph. A couple differently colored towels or pillowcases will suffice. The object is to learn how our exposure impacts our tonal ranges, and how tones translate into an important element of our final image.

It’s best to use red, green, and blue items, but whatever you have at hand will work. Set up your item and meter it. In manual mode, set your exposure to give you –3 stops exposure and make a photo. Repeat for every full stop between –3 and +3 stops. You’ll have 7 photos. Do that for the other colors. Compare them in your image editing application, and see how the saturation, texture, and feel of each color changes with the different exposures and colors. Then take the same series of photos, but put your different items in the same frame. Finally, convert the last series to monochrome, and review one last time. After reviewing them all, you can see the difference in tones and moods. This is a big part of visualization, knowing how your camera’s rendition of color and light will present itself in the final image. It’s a simple exercise that does more than give you that knowledge; it also shows you what your camera can do. By knowing that there should be texture through all the shots, you can identify where your camera begins to lose that texture. Hey, since it’s autumn, you can combine the shots with more than all you colors into making something to hang on your wall by shooting something of the autumn around you.

Hohenfels Volks: Technicolor Pathways
ISO 100, f/15, 1/25
One of my older photos, taken just outside Hormansdorf. The track to the field was dappled and the tonal range of the colors brought to mind something from childhood, a reminder that God's beauty is everywhere. Notice how dark and light tones of the same color come into play here, creating contrast and enhancing the feeling of magic.

The next exercise is patterns. Learning to recognize patterns is something we all naturally do from an early age. But, patterns can be subtle or glaring. Stucco has a nice texture, and can have something of a pattern to it if you observe it long enough. Decorative tiles, clothing, and even bark will present something to create the feeling of a pattern if you open yourself to it.

The exercise is shooting 5-10 photos of patterns around you. This can be the tracks from a tractor in a just harvested field, the still tall rows of corn, your hounds-tooth pants, anything presenting a pattern. Corn on the cob present a nice pattern that can be presented and intensified by including the green of the husk and the golden caramel brown of the outer silk. They’re everywhere once you open up to them! It’s a great way to add interest to your photography, and bring you into a closer relationship with the scenes we take for granted every day. There is so much in God’s green Earth to see and feel, that an entire lifetime isn’t enough to experience it all!

I hope everyone will get out and make some photos, both for the exercises and to celebrate autumn’s beauty. There’s no time like now to get shooting! Figure out where and when, the rest will follow. Then, make your shot and share it with us on our Hohenfels Volks Facebook page. We’d love to see your work.

Is there anything you’d like to see here? Do you have a question? Share your thoughts here or at the Hohenfels Volks Facebook page. Of course, commenting on both Facebook and here is always appreciated, too! Don't forget, we're on Google+, too!

Tuesday, November 29, 2011

Tech Talking

Greetings, Hohenfels, welcome to Hohenfels Volks, THE place for our place. Here’s hoping your week is off to a good start and Tuesday didn’t turn in to Monday part 2.

Today we’re going to introduce the concept of “Dynamic Range.” If you remember our introduction to the Zone System, there are 11 zones, 0-10. Ansel Adams considered this the full range, zones 1-9 were the dynamic range, and 2-8 the textural range. Zone 2 is the lowest value that retains discernable texture, and zone 8 is the highest value retaining usable texture, and in both cases the values where detail is preserved and recorded.

When we speak of dynamic range today, this still in some ways holds true. Metering from a gray card, it’s how many stops of exposure above and below middle gray that are usable. For instance, the EOS 7D has about 8 stops. Its range consists of 5 stops below gray before clipping to black or solid noise, and about 3 stops above middle before blowing to white. This means it runs from about zone 1 to zone 8, maybe a little higher. Each camera’s range is different; so don’t use one camera’s range to guess another’s. "Dynamic Range" determines the amount of contrast an image can have and how sharply that gets applied. It also can effect how you change the sides on your exposure triangle, based on your intention.

When you know your camera’s range, you can adjust your exposures appropriately. If you wish to increase middle gray, zone 5, to zone 6, you have to know your limits before the higher zones blow out. Taking 5 to 6 brings zone 7 to 8, and anything starting at or above 8 will be blown to solid, textureless white.

A camera’s range often times is limited by the size of the photocells or photosites. These are the individual receptors on the camera sensor. A larger frame sensor will usually have larger photocells, allowing more light to be received and detail retained. There are millions per most of today’s sensors.

Another way to expand your “Dynamic Range” is to always shoot RAW, as your camera records more information. You can add up to a stop and a half shooting RAW. Shooting automatically and in JPEG mode can cost you that latitude in your exposure. Keep that in mind when shooting in very bright or low light conditions.

Well, that about wraps up our discussion. Try to keep that in mind when you’re out capturing the beauty of Hohenfels, our area, and your holidays. The results will amaze you.

On to other things, I’d like to remind all of you to get your votes in and get working on your photos for this week’s theme, “Morning Moments.” I can’t wait to see what you amaze me with!

Shoot for the love, of photography, your subjects, and your art, it really will show! Get shooting and start posting at the Hohenfels Volks Facebook page. Of course, commenting here is always welcome, too!